The cure for electric vehicle range anxiety? It’s not bigger batteries, says Mercedes-Benz. It’s faster charging. Sure, a bigger battery will take you further between charges. But there are significant downsides. A bigger battery not only takes up a lot more real estate in a vehicle but also adds a lot more cost and weight. Especially weight. The GMC Sierra EV AT4 pickup, for example, has a 205-kWh battery that delivers an impressive EPA-rated range of 478 miles. But the truck weighs a stagg...